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1# RUN: llc -mtriple=thumbv8.1m.main %s -run-pass=arm-low-overhead-loops --verify-machineinstrs -o - | FileCheck %s2 3# CHECK: while.body:4# CHECK-NOT: t2DLS5# CHECK-NOT: t2LEUpdate6 7--- |8 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"9 target triple = "thumbv8.1m.main"10 11 define i32 @mov_between_dec_end(i32 %n) #0 {12 entry:13 %cmp6 = icmp eq i32 %n, 014 br i1 %cmp6, label %while.end, label %while.body.preheader15 16 while.body.preheader: ; preds = %entry17 %start = call i32 @llvm.start.loop.iterations.i32(i32 %n)18 br label %while.body19 20 while.body: ; preds = %while.body, %while.body.preheader21 %0 = phi i32 [ %start, %while.body.preheader ], [ %1, %while.body ]22 %1 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)23 %add = add i32 %1, 024 %2 = icmp ne i32 %1, 025 br i1 %2, label %while.body, label %while.end26 27 while.end: ; preds = %while.body, %entry28 %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.body ]29 ret i32 %res.0.lcssa30 }31 32 declare i32 @llvm.start.loop.iterations.i32(i32) #133 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #134 35 attributes #0 = { "target-features"="+mve.fp" }36 attributes #1 = { noduplicate nounwind }37 attributes #2 = { nounwind }38 39...40---41name: mov_between_dec_end42alignment: 243exposesReturnsTwice: false44legalized: false45regBankSelected: false46selected: false47failedISel: false48tracksRegLiveness: true49hasWinCFI: false50registers: []51liveins:52 - { reg: '$r0', virtual-reg: '' }53frameInfo:54 isFrameAddressTaken: false55 isReturnAddressTaken: false56 hasStackMap: false57 hasPatchPoint: false58 stackSize: 859 offsetAdjustment: 060 maxAlignment: 461 adjustsStack: false62 hasCalls: false63 stackProtector: ''64 maxCallFrameSize: 065 cvBytesOfCalleeSavedRegisters: 066 hasOpaqueSPAdjustment: false67 hasVAStart: false68 hasMustTailInVarArgFunc: false69 localFrameSize: 070 savePoint: []71 restorePoint: []72fixedStack: []73stack:74 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 75 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false, 76 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }77 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4, 78 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true, 79 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }80callSites: []81constants: []82machineFunctionInfo: {}83body: |84 bb.0.entry:85 successors: %bb.4(0x30000000), %bb.1(0x50000000)86 liveins: $r0, $r7, $lr87 88 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp89 frame-setup CFI_INSTRUCTION def_cfa_offset 890 frame-setup CFI_INSTRUCTION offset $lr, -491 frame-setup CFI_INSTRUCTION offset $r7, -892 tCBZ $r0, %bb.493 94 bb.1.while.body.preheader:95 successors: %bb.2(0x80000000)96 liveins: $r097 98 $lr = tMOVr $r0, 14, $noreg99 $lr = t2DoLoopStart killed $r0100 101 bb.2.while.body:102 successors: %bb.2(0x7c000000), %bb.3(0x04000000)103 liveins: $lr, $r4104 105 renamable $r4 = nsw tADDhirr killed renamable $r4, killed renamable $r4, 14, $noreg106 renamable $lr = t2LoopDec killed renamable $lr, 1107 renamable $r4 = tMOVr $lr, 14, $noreg108 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr109 tB %bb.3, 14, $noreg110 111 bb.3.while.end:112 liveins: $lr113 114 $r0 = tMOVr killed $lr, 14, $noreg115 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0116 117 bb.4:118 renamable $lr = t2MOVi 0, 14, $noreg, $noreg119 $r0 = tMOVr killed $lr, 14, $noreg120 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0121 122...123